Optimizing Service Data Transmission in an OGSA Based Grid System

Abstract

The problem of providing suitable data transmission mechanism among services is critical in an Open Grid Services Architecture (OGSA) based grid system. Four typical data transmission methods between two services are provided first. Then for one complex data transmission patterns among multiple services, the corresponding data transmission scheduling mechanism is discussed in detail. Based on the steps of one data transmission path between two services, a data transmission performance prediction model is described. Together with some implementation and environment dependent parameters, the model can provide different performance prediction functions for different data transmission methods. At the same time, a set of comparison experiments have been designed and tested in a grid environment built up with Globus Toolkit 3. The comparison results show that the theoretical data transmission performance is very close to the experimental performance. At the end of the paper, a grid data transmission optimizing MetaService is designed to select suitable transmission mechanism in a grid environment dynamically. The MetaService can adapt to different scenarios, and improve the data transmission performance.